Add alert in anim trees if resource load fails

Add_menu_type implements a resource loading, but only when
the resource is initially valid. No alert message is shown
if the resource isn't valid, leaving the user without feedback.

This commit adds an else clause to the is_valid command to give
feedback to the user when loading an animationPlaybackNode into
an animation tree fails.

4 files changed, 8 insertions, 0 deletions

diff --git a/editor/plugins/animation_blend_space_1d_editor.cpp b/editor/plugins/animation_blend_space_1d_editor.cpp
index d335b29c2f..0ce1f970e8 100644
--- a/editor/plugins/animation_blend_space_1d_editor.cpp
+++ b/editor/plugins/animation_blend_space_1d_editor.cpp
@@ -363,6 +363,8 @@ void AnimationNodeBlendSpace1DEditor::_file_opened(const String &p_file) {
 	file_loaded = ResourceLoader::load(p_file);
 	if (file_loaded.is_valid()) {
 		_add_menu_type(MENU_LOAD_FILE_CONFIRM);
+	} else {
+		EditorNode::get_singleton()->show_warning(TTR("This type of node can't be used. Only root nodes are allowed."));
 	}
 }
 
diff --git a/editor/plugins/animation_blend_space_2d_editor.cpp b/editor/plugins/animation_blend_space_2d_editor.cpp
index 805df0cbb9..2d62878907 100644
--- a/editor/plugins/animation_blend_space_2d_editor.cpp
+++ b/editor/plugins/animation_blend_space_2d_editor.cpp
@@ -286,6 +286,8 @@ void AnimationNodeBlendSpace2DEditor::_file_opened(const String &p_file) {
 	file_loaded = ResourceLoader::load(p_file);
 	if (file_loaded.is_valid()) {
 		_add_menu_type(MENU_LOAD_FILE_CONFIRM);
+	} else {
+		EditorNode::get_singleton()->show_warning(TTR("This type of node can't be used. Only root nodes are allowed."));
 	}
 }
 
diff --git a/editor/plugins/animation_blend_tree_editor_plugin.cpp b/editor/plugins/animation_blend_tree_editor_plugin.cpp
index 6419f62343..f5e1788bb7 100644
--- a/editor/plugins/animation_blend_tree_editor_plugin.cpp
+++ b/editor/plugins/animation_blend_tree_editor_plugin.cpp
@@ -261,6 +261,8 @@ void AnimationNodeBlendTreeEditor::_file_opened(const String &p_file) {
 	file_loaded = ResourceLoader::load(p_file);
 	if (file_loaded.is_valid()) {
 		_add_node(MENU_LOAD_FILE_CONFIRM);
+	} else {
+		EditorNode::get_singleton()->show_warning(TTR("This type of node can't be used. Only root nodes are allowed."));
 	}
 }
 
diff --git a/editor/plugins/animation_state_machine_editor.cpp b/editor/plugins/animation_state_machine_editor.cpp
index 26006d85c9..14468a81eb 100644
--- a/editor/plugins/animation_state_machine_editor.cpp
+++ b/editor/plugins/animation_state_machine_editor.cpp
@@ -392,6 +392,8 @@ void AnimationNodeStateMachineEditor::_file_opened(const String &p_file) {
 	file_loaded = ResourceLoader::load(p_file);
 	if (file_loaded.is_valid()) {
 		_add_menu_type(MENU_LOAD_FILE_CONFIRM);
+	} else {
+		EditorNode::get_singleton()->show_warning(TTR("This type of node can't be used. Only root nodes are allowed."));
 	}
 }